What causes Siemens SINUMERIK alarm 101203?

Normal control operation generated this status message. User action or program command triggered this notification. System configuration or commissioning activity produced this message. Machine data or parameter change created this notification.

How do I fix Siemens SINUMERIK alarm 101203?

1. Read the complete message text on the SINUMERIK screen — note any parameter values shown. 2. If action is required, follow the instructions in the message. 3. Acknowledge the message on the operator panel to continue operation. 4. Consult the Siemens SINUMERIK alarm documentation for message 101203 if clarification is needed. 5. If this message appears unexpectedly, review recent parameter or configuration changes.

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Siemens SINUMERIK Controller

Safety · Intermediate · 30-120 minutes

Alarm 101203

Siemens 840D 101203 - SI data not copied completely

Alarm 101203 indicates that Safety Integrated (SI) data from the control system was not completely transferred to the safety PLC or drive safety modules during initialization or data synchronization. This typically occurs during system startup, after a power cycle, or when safety parameters are modified and the safety data communication between NCK and the safety components is incomplete or interrupted.

Siemens SINUMERIKSafetyIntermediate30-120 minutes

101203

Siemens 840D 101203 - SI data not copied completely

SI data not copied completely

Root Cause Summary

Alarm 101203 indicates that Safety Integrated (SI) data from the control system was not completely transferred to the safety PLC or drive safety modules during initialization or data synchronization. This typically occurs during system startup, after a power cycle, or when safety parameters are modified and the safety data communication between NCK and the safety components is incomplete or interrupted.

Safety

Refer to Siemens documentation
Ensure qualified technician performs repairs

Causes and Fixes

1
Perform a complete power cycle of the entire system: NCK, PLC, drives, and HMI. Wait 30 seconds before powering back on.
2
Check the boot sequence timing in the commissioning data. Verify that the safety PLC is fully initialized before NCK attempts SI data transfer.
3
Review the startup diagnostics buffer for additional communication errors or timeout messages that occurred before alarm 101203.
4
If alarm persists, perform a complete safety acceptance test and verify SI data consistency using the Safety Commissioning tool in STARTER or Safety Integrated application.
Safety acceptance test must be performed according to local safety regulations

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